intel-mkl-tool: Compilation problem with anyhow 1.0.49

[relf]

Following the release of anyhow 1.0.49, I get the following compilation error:

  
...
   Compiling ndarray-linalg v0.14.1
   Compiling zstd v0.5.4+zstd.1.4.7
   Compiling intel-mkl-tool v0.2.0+mkl2020.1
error[E0532]: expected tuple struct or tuple variant, found function `Ok`
  --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/intel-mkl-tool-0.2.0+mkl2020.1/src/entry.rs:75:16
   |
75 |         if let Ok(dir) = std::env::var("OUT_DIR") {
   |                ^^ not a tuple struct or tuple variant
   |
help: consider importing one of these items instead
   |
1  | use core::result::Result::Ok;
   |
1  | use std::result::Result::Ok;
   |
...

It seems like the new Ok() function introduced in anyhow breaks the code. see anyhow 1.0.49 release. Pinning anyhow to 1.0.48 solves the problem.
@dtolnay, to also bring this to your attention.

[YuhanLiin]

Issue is the use anyhow::*; in lib.rs, which reexports every item in anyhow internally. Since entry.rs has the line use crate::*;, it also imports every item in anyhow, including Ok.

[hombit]

I've opened #70 to fix it, but we need @termoshtt or another maintainer to merge it